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b = - 3
c = 5
(- 5a + 10b) x (2a + c)
(- 5(- 5) + 10(- 3)) x (2(- 5) + 5)
(25 - 30) x (- 10 + 5)
(- 5) x (- 5)
25
{25 + -30 } di kali {2 (0)}
-5 di kali 0
= 0